Developer Reference for Intel® oneAPI Math Kernel Library for Fortran
?lamc5
Called from ?lamc2 . Attempts to compute the largest machine floating-point number, without overflow.
Syntax
call slamc5 ( beta , p , emin , ieee , emax , rmax )
call dlamc5 ( beta , p , emin , ieee , emax , rmax )
Include Files
mkl.fi
Description
slamc5 dlamc5
The routine ?lamc5 attempts to compute rmax , the largest machine floating-point number, without overflow. It assumes that emax + abs(emin) sum approximately to a power of 2. It will fail on machines where this assumption does not hold, for example, the Cyber 205 ( emin = -28625 , emax = 28718 ). It will also fail if the value supplied for emin is too large (that is, too close to zero), probably with overflow.
Input Parameters
- beta
-
INTEGER . The base of floating-point arithmetic.
- p
-
INTEGER . The number of base beta digits in the mantissa of a floating-point value.
- emin
-
INTEGER . The minimum exponent before (gradual) underflow.
- ieee
-
LOGICAL . A logical flag specifying whether or not the arithmetic system is thought to comply with the IEEE standard.
Output Parameters
- emax
-
INTEGER . The largest exponent before overflow.
- rmax
-
REAL for slamc5 DOUBLE PRECISION for dlamc5 The largest machine floating-point number.